Re: hp dv8000t dead on resume from RAM

Rafael J. Wysocki
2006-08-08T20:31:51Z

On Tuesday 08 August 2006 19:15, Brannon Barrett Klopfer wrote:
> Howdy,
>
> My hp dv8000t (core duo) is completely dead on resume from RAM (no caps
> lock, sysrq, netconsole,
> nothing). I've tried a recent (2.6.18-rc4) kernel running almost entirely
> naked, so to speak (~990K) -- no support for:
>
> SMP
> preempt
> modules
> networking (+ enet drivers, unless running netconsole)
> USB and SATA (not at same time; rootfs is either usb drive or SATA [ext2/3])
> FireWire
> cpufreq
> framebuffer (vga=0)
> audio
> PCMCIA
> IDE (for cdrom)
>
> I've tried both native SATA (ahci) and legacy (ata_piix), but same result
> w/both -- completely dead on resume from RAM. Blindly entering commands
> does nothing, and running "$suspend ; $shutdown" does nothing either. I've
> also tried with and without noapic, and a number of other kernel
> paramaters, but nothing seems to work.
>
> Be more than happy to try out patches, etc. to get this thing working.
> Additionally, if someone could point me to that "beep on resume" patch,
> that'd be great.

First, please apply the appended patch and try the following:

(1)
# echo testproc > /sys/power/disk
# echo disk > /sys/power/state

This should turn off the non-boot CPU, freeze all processes, wait for 5
seconds and then thaw the processes and the CPU.

(2)
# echo test > /sys/power/disk
# echo disk > /sys/power/state

This should turn off the non-boot CPU, freeze all processes, shrink
memory, suspend all devices, wait for 5 seconds, resume the devices etc.
IOW it does everything that's needed for a suspend except for actually
suspending.

Greetings,
Rafael

---
include/linux/pm.h | 4 +++-
kernel/power/disk.c | 37 ++++++++++++++++++++++++++++---------
2 files changed, 31 insertions(+), 10 deletions(-)

Index: linux-2.6.18-rc3-mm2/include/linux/pm.h
===================================================================
--- linux-2.6.18-rc3-mm2.orig/include/linux/pm.h
+++ linux-2.6.18-rc3-mm2/include/linux/pm.h
@@ -116,7 +116,9 @@ typedef int __bitwise suspend_disk_metho
#define PM_DISK_PLATFORM ((__force suspend_disk_method_t) 2)
#define PM_DISK_SHUTDOWN ((__force suspend_disk_method_t) 3)
#define PM_DISK_REBOOT ((__force suspend_disk_method_t) 4)
-#define PM_DISK_MAX ((__force suspend_disk_method_t) 5)
+#define PM_DISK_TEST ((__force suspend_disk_method_t) 5)
+#define PM_DISK_TESTPROC ((__force suspend_disk_method_t) 6)
+#define PM_DISK_MAX ((__force suspend_disk_method_t) 7)

struct pm_ops {
suspend_disk_method_t pm_disk_mode;
Index: linux-2.6.18-rc3-mm2/kernel/power/disk.c
===================================================================
--- linux-2.6.18-rc3-mm2.orig/kernel/power/disk.c
+++ linux-2.6.18-rc3-mm2/kernel/power/disk.c
@@ -70,7 +70,7 @@ static inline void platform_finish(void)

static int prepare_processes(void)
{
- int error;
+ int error = 0;

pm_prepare_console();

@@ -83,6 +83,12 @@ static int prepare_processes(void)
goto thaw;
}

+ if (pm_disk_mode == PM_DISK_TESTPROC) {
+ printk("swsusp debug: Waiting for 5 seconds.\n");
+ mdelay(5000);
+ goto thaw;
+ }
+
/* Free memory before shutting down devices. */
if (!(error = swsusp_shrink_memory()))
return 0;
@@ -119,11 +125,19 @@ int pm_suspend_disk(void)
if (error)
return error;

+ if (pm_disk_mode == PM_DISK_TESTPROC)
+ goto Thaw;
+
error = device_suspend(PMSG_FREEZE);
if (error) {
printk("Some devices failed to suspend\n");
- unprepare_processes();
- return error;
+ goto Thaw;
+ }
+
+ if (pm_disk_mode == PM_DISK_TEST) {
+ printk("swsusp debug: Waiting for 5 seconds.\n");
+ mdelay(5000);
+ goto Done;
}

pr_debug("PM: snapshotting memory.\n");
@@ -139,15 +153,16 @@ int pm_suspend_disk(void)
power_down(pm_disk_mode);
else {
swsusp_free();
- unprepare_processes();
- return error;
+ goto Thaw;
}
- } else
+ } else {
pr_debug("PM: Image restored successfully.\n");
+ }

swsusp_free();
Done:
device_resume();
+ Thaw:
unprepare_processes();
return error;
}
@@ -241,6 +256,8 @@ static const char * const pm_disk_modes[
[PM_DISK_PLATFORM] = "platform",
[PM_DISK_SHUTDOWN] = "shutdown",
[PM_DISK_REBOOT] = "reboot",
+ [PM_DISK_TEST] = "test",
+ [PM_DISK_TESTPROC] = "testproc",
};

/**
@@ -295,17 +312,19 @@ static ssize_t disk_store(struct subsyst
}
}
if (mode) {
- if (mode == PM_DISK_SHUTDOWN || mode == PM_DISK_REBOOT)
+ if (mode == PM_DISK_SHUTDOWN || mode == PM_DISK_REBOOT ||
+ mode == PM_DISK_TEST || mode == PM_DISK_TESTPROC) {
pm_disk_mode = mode;
- else {
+ } else {
if (pm_ops && pm_ops->enter &&
(mode == pm_ops->pm_disk_mode))
pm_disk_mode = mode;
else
error = -EINVAL;
}
- } else
+ } else {
error = -EINVAL;
+ }

pr_debug("PM: suspend-to-disk mode set to '%s'\n",
pm_disk_modes[mode]);